Final answer:
The expression 79.1 + 100 can be solved by simply adding the two numbers together, resulting in a sum of 179.1.
Step-by-step explanation:
The expression 79.1 + 100 can be solved by simply adding the two numbers together. When you add 79.1 and 100, you get a sum of 179.1. Therefore, the correct answer is option a) 179.1.